JP2004232274A - Retaining structure for adjustment of strain of rubber elastic supporter and method for adjusting strain by using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holding structure in the case the adjustment of rubber elastic supporter strain, by which a construction cost can be reduced by decreasing the number of pushing moving means such as jacks, efficiently conducting strain-adjustment work and a method for adjusting strain by using it. <P>SOLUTION: A lower base plate 2 is so constituted that first projecting sections 23 are formed on both sides while a lower mounting plate 12 is constituted by forming second projecting sections 15 on both sides, and holding jigs 4 holding spaces of the first projecting sections 23 and the second projecting sections 15 are engaged with the sections 23 and the sections 15 when shear strain is removed from a rubber elastic supporter 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a holding structure and a strain adjusting method for adjusting a strain of a rubber-like elastic bearing member disposed between a lower structure such as a bridge pier and an upper structure such as a bridge girder. The present invention relates to a holding structure for adjusting the strain of a rubber-like elastic supporter, which reduces the number of means to reduce working costs, and a strain adjusting method using the same.
[0002]
[Prior art]
Generally, a rubber-like elastic bearing is installed between a lower structure such as a pier and an upper structure such as a bridge girder, and the vibration-like energy and rolling from the upper structure are reduced by the rubber-like elastic bearing. Is transmitted to the lower structure, and the upper structure can be expanded and contracted by the temperature change on the lower structure.
[0003]
By the way, an upper structure such as a concrete bridge girder dries and shrinks after the concrete is cast until the concrete is completely hardened. Accordingly, the rubber-like elastic bearing body undergoes shear deformation.
[0004]
Therefore, conventionally, as one of the above-mentioned measures, there is a method of removing the deformation from the rubber-like elastic bearing body which has been sheared and deformed when the contraction is completed. The lower mounting plate is slid on the lower base plate by means of a jack (pressing and moving means), and the lower mounting plate is slid and adjusted to an upright posture without distortion, and then the lower mounting plate is fixed on the lower base plate. (For example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-11-117227 (page 2)
[0006]
[Problems to be solved by the invention]
However, in the adjustment method as described above, it is necessary to hold the lower mounting plate with the jack until the operation of fixing the lower mounting plate to the lower base plate is completed, and the jack cannot be used at the next location until the fixing operation is completed. . Therefore, in order to perform the strain adjustment work efficiently, it is necessary to prepare a large number of expensive jacks, which has been a factor that hinders the reduction of the construction cost.
[0007]
In addition, there is a similar problem at the time of adjusting the strain when attaching the rubber-like elastic support by applying a shearing deformation in advance according to the contraction amount of the upper structure when the rubber-like elastic support is installed.
[0008]
The present invention provides a rubber-like elastic bearing strain holding structure capable of reducing the number of pressing and moving means such as jacks and reducing construction costs while efficiently performing strain adjustment work, and a strain adjustment using the same. It is to provide a method.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the holding structure of the present invention for adjusting the elasticity of the rubber-like elastic bearing body is configured such that the upper and lower base plates fixed to the upper surface of the lower structure and the upper base plate fixed to the lower surface of the expandable and contractible upper and lower substrates are vertically movable. After attaching a rubber-like elastic bearing body constituted by providing a bearing part between the mounting plates, a holding structure at the time of strain adjustment for removing shear strain from the rubber-like elastic bearing body that has been sheared and deformed by expansion and contraction of the upper structure. Wherein the lower base plate is provided with first protrusions on both sides thereof in a direction intersecting the direction of the shear deformation, while the lower mounting plate is positioned in a direction intersecting the direction of the shear deformation. The second projections are provided on both sides of the elastic support, and when the shear strain is removed from the rubber-like elastic support, the first projection and the second projection maintain the distance therebetween. Characterized in that engaging the lifting jig.
[0010]
The rubber-like elastic support body strain adjusting method of the present invention includes a support portion between upper and lower mounting plates between a lower base plate fixed to an upper surface of a lower structure and an upper base plate fixed to a lower surface of an expandable and contractible upper structure. A method for adjusting a strain, comprising: removing a shear strain from the rubber-like elastic bearing member that has been sheared by the expansion and contraction of the upper structure after attaching the rubber-like elastic bearing member provided and provided. The first mounting portion is provided on both sides located in a direction intersecting the direction in which the first mounting portion is provided, and the second mounting portions are provided on both sides located in a direction intersecting the direction in which the lower mounting plate is sheared. Then, the lower mounting plate is moved on the lower base plate in the direction of the shear deformation by the pressing and moving means, so that the lower elastic plate is subjected to the shear strain from the rubber-like elastic support body. After removing and maintaining the state where the shearing strain is removed by engaging a holding jig for maintaining the distance between the first protrusion and the second protrusion, the pressing and moving means is removed and the lower mounting is removed. After the plate is fixed to the lower base plate, the holding jig is removed.
[0011]
When the shear strain is removed from the rubber-like elastic support body in this manner, the holding jig maintains the distance between the first protrusion of the lower base plate and the second protrusion of the lower mounting plate, and maintains that state. It is not necessary to hold the lower mounting plate with the pressing and moving means until the operation of fixing the lower mounting plate to the lower base plate is completed, and the pressing and holding means removed at the next location during the fixing operation can be used.
[0012]
For this reason, the number of pressing / moving means such as jacks can be reduced as compared with the related art, so that the construction cost can be reduced. Since only the holding jig needs to be engaged with the projecting portions of the lower base plate and the lower mounting plate, the efficiency of the strain adjustment operation is not impaired.
[0013]
Further, another holding structure for adjusting the elasticity of the rubber-like elastic bearing body of the present invention is that the upper and lower base plates fixed to the upper surface of the lower structure and the upper base plate fixed to the lower surface of the contracting upper structure are vertically arranged. When a rubber-like elastic bearing body having a support portion provided between mounting plates is attached, the rubber-like elastic bearing body is fixed to the upper base plate in accordance with the amount of contraction of the upper structure while the upper mounting plate is fixed to the upper base plate. A holding structure at the time of strain adjustment for applying a shear strain amount in advance, wherein the lower base plate has a configuration in which first protrusions are provided on both sides located in a direction intersecting with a direction for applying the shear strain. The lower mounting plate is formed by providing second protrusions on both sides located in a direction intersecting the direction in which the shear strain is applied, and the rubber-like elastic bearing body accommodates the upper structure. Upon imparting shear strain amount corresponding to the amount, characterized in that engaging the holding jig for holding the distance to the second projecting portion and the first projecting portion.
[0014]
Another method for adjusting the strain of a rubber-like elastic bearing body according to the present invention is a method for adjusting a strain between a lower mounting plate fixed to an upper surface of a lower structure and an upper base plate fixed to a lower surface of a contracting upper structure. When a rubber-like elastic bearing body provided with a portion is attached, the amount of shear strain corresponding to the amount of shrinkage of the upper structure is reduced on the rubber-like elastic bearing body with the upper mounting plate fixed to the upper base plate. A method of adjusting strain to be applied in advance, wherein the lower base plate has a configuration in which first protrusions are provided on both sides located in a direction intersecting a direction in which shear strain is applied, while the lower mounting plate is configured to reduce the shear strain. A second projecting portion is provided on both sides located in a direction intersecting with the direction of application, and the lower mounting plate is placed on the lower base plate by pressing and moving means. By moving in the direction in which the shearing strain is applied, a shearing strain is applied to the rubber-like elastic support according to the amount of shrinkage of the upper structure, and the distance between the first protrusion and the second protrusion is maintained. After maintaining the shear strain amount by engaging a holding jig to be removed, removing the pressing and moving means, fixing the lower mounting plate to the lower base plate, and then removing the holding jig. I do.
[0015]
As described above, even when the rubber-like elastic bearing member is installed, when the shear strain amount corresponding to the contraction amount of the upper structure is applied to the rubber-like elastic bearing member, the holding jig and the first projecting portion of the lower base plate are used. In order to maintain the interval between the second protrusions of the lower mounting plate and maintain the amount of shear strain, it is not necessary to hold the lower mounting plate with the pressing and moving means until the operation of fixing the lower mounting plate to the lower base plate is completed. The pressing and holding means removed at the next attachment point can be used.
[0016]
Therefore, the number of pressing and moving means such as jacks can be reduced, so that the construction cost can be reduced. Since only the holding jig needs to be engaged with the projecting portions of the lower base plate and the lower mounting plate, the strain adjustment operation can be performed efficiently.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
[0018]
FIG. 1 shows a state before adjustment of strain in a rubber-like elastic supporter sheared by drying shrinkage of an upper structure after installation of a rubber-like elastic supporter, and FIG. 2 shows a state after adjustment. Reference numeral 2 denotes a lower structure such as a pier, 3 denotes an upper structure that shrinks and shrinks, such as a concrete bridge girder, and 4 denotes a holding jig.
[0019]
The rubber-like elastic bearing body 1 has a structure in which a bearing portion 13 formed by alternately laminating a rubber layer (not shown) and a steel plate is provided between upper and lower mounting plates 11 and 12 made of metal. A metal lower base plate 21 is fixed to the upper surface of the lower structure 2 via an anchor bar 22. A metal upper base plate 31 is fixed to a lower surface of the upper structure 3 via an anchor bar 32.
[0020]
The rubber-like elastic support 1 is mounted between the lower base plate 21 and the upper base plate 31, the upper mounting plate 11 is fixed to the upper base plate 31 by bolts 14, and the lower mounting plate 12 is fixed to the lower base plate 21 by bolts 16. I have.
[0021]
The lower base plate 21 has a first protruding portion 23 at the center of both middle portions located in a direction intersecting at right angles with the direction X in which the rubber-like elastic bearing body 1 has been sheared (the direction in which the upper structure 1 has contracted). It is provided integrally. The lower mounting plate 12 is integrally provided with second protrusions 15 at both ends on both sides located in a direction intersecting at right angles to the direction X in which the rubber-like elastic bearing body 1 is sheared.
[0022]
As shown in FIG. 3, the holding jig 4 has a rectangular parallelepiped metal jig main body 41, and the first protruding portion 23 can be fitted on one side (the direction X in the direction of shear deformation) of the lower surface 41a. The first concave portion 42 is provided. On the upper surface 41b, a second concave portion 43 is formed on the other side (opposite to the direction X in which the shearing deformation occurs) of the first concave portion 42 so as to accommodate the second projecting portion 15B at the other end. The other end 41c of the jig body 41 is screwed with a bolt 44 projecting from the other side into the second recess 43 so as to be able to advance and retreat. Further, the holding jig 4 has a block-shaped shim 45 arranged in the second recess 43.
[0023]
Hereinafter, the holding structure at the time of strain adjustment of the present invention after installation of the rubber-like elastic support 1 using the above-described holding jig 4 will be described together with a strain adjusting method. First, in the state of FIG. 1, a jack or the like is provided between both the first protrusions 23 of the lower base plate 21 and one of the two second protrusions 15 </ b> A (the protrusion in the direction X of the sheared deformation) of the lower mounting plate 12. After the pressing and moving means 5 is arranged, the bolts 16 are removed to make the lower mounting plate 12 slidable on the lower base plate 21.
[0024]
Next, the pressing and moving means 5 is operated to press the second projecting portion 15A, and the lower mounting plate 12 is slid on the lower base plate 21 in the direction X in which the lower mounting plate 12 is sheared.
As shown in FIG. 2, after adjusting the rubber-like elastic bearing body 1 so as to be in the upright posture and removing the shear strain from the rubber-like elastic bearing body 1, both the first protrusions 23 and the other two second The holding jigs 4 for maintaining the gap are respectively engaged with the protruding portions 15B to maintain the rubber-like elastic support 1 in a state where the shear strain has been removed.
[0025]
At this time, the first protrusion 23 is fitted into the first recess 42 of the jig main body 41, the second protrusion 15B is accommodated in the second recess 43, and the shim 45 is attached to the other side of the second protrusion 15B. Then, the holding jig 4 is attached by advancing the bolt 44 and bringing its tip into contact with the shim 45 (state of FIG. 2). Thereby, a holding structure at the time of strain adjustment by the holding jig 4 is formed.
[0026]
After disposing the holding jig 4, the pressing and moving means 5 is removed. The removed pressing / moving means 5 is used at the following location. Next, after fixing the lower mounting plate 12 to the lower base plate 21 with the bolts 16, the bolts 44 are retracted to release the contact with the shims 45, and the holding jig 4 is removed. The rubber-like elastic support 1 is fixed between the lower base plate 21 and the upper base plate 31 in a state where the shear strain caused by drying shrinkage is removed.
[0027]
According to the present invention described above, when the shear strain is removed from the rubber-like elastic support 1, the distance between the first protrusion 23 of the lower base plate 21 and the second protrusion 15 of the lower mounting plate 12 by the holding jig 4. And the state is maintained, so that it is not necessary to hold the lower mounting plate 12 with the pressing and moving means 5 until the operation of fixing the lower mounting plate 12 to the lower base plate 21 is completed. Holding means 5 can be used.
[0028]
Therefore, the number of pressing / moving means 5 such as jacks can be reduced as compared with the related art, and the construction cost can be reduced. Since it is only necessary to engage the holding jig 4 with the projections 23 and 15 of the lower base plate 21 and the lower mounting plate 12, strain adjustment work can be performed efficiently.
[0029]
FIGS. 4 and 5 show the strain adjustment when the rubber-like elastic support 1 is attached by applying a shearing deformation according to the amount of contraction of the upper structure 3 in advance when the rubber-like elastic support 1 is installed. Before distortion adjustment, FIG. 5 shows after distortion adjustment. The same members as those described above are denoted by the same reference numerals and description thereof will be omitted. Note that the direction X in which the above-described shear deformation is performed is to be read as the direction in which the shear strain is applied to the rubber-like elastic support 1 (the direction in which the upper structure 1 contracts).
[0030]
In the state before the strain adjustment shown in FIG. 4, when the rubber-like elastic support 1 is arranged in an upright posture between the lower base plate 21 and the upper base plate 31, the upper mounting plate 11 of the rubber-like elastic support 1 becomes the upper base plate. The lower mounting plate 12 is slidably mounted on the lower base plate 21 while being fixed to the base 31 by the bolts 14.
[0031]
Hereinafter, the holding structure at the time of strain adjustment when the amount of shear strain is previously applied to the rubber-like elastic bearing body 1 will be described together with the strain adjustment method. In the state shown in FIG. 4, the jack is inserted between the two first protrusions 23 of the lower base plate 21 and one of the two second protrusions 15 </ b> A of the lower mounting plate 12 (the protrusion in the direction X in which the shear strain is applied). After the pressing and moving means 5 is disposed, the pressing and moving means 5 is operated to press the second projecting portion 15A, and the lower mounting plate 12 is slid and moved on the lower base plate 21 in the direction X in which shear strain is applied. .
[0032]
As a result, the rubber-like elastic bearing body 1 is subjected to shear deformation as shown in FIG. After a shear strain is applied to the rubber-like elastic support 1 by an amount corresponding to the amount of contraction of the upper structure 3, the distance is maintained between the first projections 23 and the other second projections 15B. The holding jigs 4 are engaged with each other to maintain the shear strain amount.
[0033]
At this time, the first protrusion 23 is fitted into the first recess 42 of the jig main body 41, the second protrusion 15B is accommodated in the second recess 43, and the shim 45 is attached to the other side of the second protrusion 15B. Then, the holding jig 4 is attached by advancing the bolt 44 and bringing its tip into contact with the shim 45 (the state of FIG. 5). Thereby, a holding structure at the time of strain adjustment by the holding jig 4 is formed.
[0034]
After disposing the holding jig 4, the pressing and moving means 5 is removed. The removed pressing / moving means 5 is used at the following location. Next, after the lower mounting plate 12 is fixed to the lower base plate 21 by bolts or welding, the bolts 44 are retracted to release the contact with the shims 45, and the holding jig 4 is removed. The rubber-like elastic support 1 is fixed between the lower base plate 21 and the upper base plate 31 in a state where a shear strain amount corresponding to the contraction amount of the upper structure 3 is given in advance.
[0035]
When the amount of shear strain corresponding to the amount of contraction of the upper structure 3 is imparted to the rubber-like elastic support 1 in this manner, the first projecting portion 23 of the lower base plate 21 and the (2) Since the distance between the protrusions 15 is maintained and the amount of shear strain is maintained, it is not necessary to hold the lower mounting plate 12 with the pressing and moving means 5 until the operation of fixing the lower mounting plate 12 to the lower base plate 21 is completed. The pressing and holding means 5 can be used in the following places.
[0036]
Therefore, it is possible to reduce the number of pressing and moving means 5 such as jacks, thereby reducing the construction cost. Since it is only necessary to engage the holding jig 4 with the projections 23 and 15 of the lower base plate 21 and the lower mounting plate 12, the efficiency of strain adjustment work is not impaired.
[0037]
In the present invention, the shim 45 is preferably used when the space between the second protrusion 15B and the other end 41c of the jig body 41 is large when the second protrusion 15B is accommodated in the second recess 43. It is used and does not necessarily need to be used, and the tip of the bolt 44 may be brought into contact with the other side of the second protrusion 15B.
[0038]
The holding jig 4 can preferably use the above-described structure, but is not limited thereto. When the shear strain is removed from the rubber-like elastic support 1, or when the upper structure 3 is attached to the rubber-like elastic support 1. When a shear strain amount corresponding to the shrinkage amount is applied, other modes may be used as long as they can engage with the first projecting portion 23 and the second projecting portion 15 to maintain the distance therebetween.
[0039]
The present invention can be suitably used for strain adjustment when the upper structure 3 such as a concrete bridge girder dries and shrinks as described above. However, the present invention is not limited to this. After the rubber-like elastic bearing body 1 is installed, It can also be preferably used for strain adjustment when the upper structure 3 expands and contracts due to a temperature change and the like, thereby causing shear deformation of the rubber-like elastic support 1.
[0040]
【The invention's effect】
As described above, in the present invention, when the shear strain is removed from the rubber-like elastic bearing body after installation, or the rubber-like elastic bearing body at the time of installation is provided with a shear strain amount corresponding to the contraction amount of the upper structure. At this time, a holding jig for maintaining the interval is engaged with the first protrusion of the lower base plate and the second protrusion of the lower mounting plate, and the state is maintained by the holding jig. While efficiently performing the above, it is possible to reduce the number of pressing and moving means such as jacks, thereby reducing the construction cost.
[Brief description of the drawings]
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a state of a rubber-like elastic bearing body strain-adjusted according to the present invention before installation, in which a shear-induced deformation of a rubber-like elastic bearing body before adjustment is performed. It is arrow sectional drawing of (a).
2A and 2B show a holding structure when strain adjustment of the rubber-like elastic bearing body of FIG. 1 is performed, wherein FIG. 2A is a front view, and FIG. 2B is a cross-sectional view of FIG.
3A and 3B show an example of a holding jig. FIG. 3A is an enlarged front view, and FIG. 3B is an enlarged plan view.
FIG. 4 is a front view of another example of the method of adjusting the strain of the rubber-like elastic support of the present invention, before the strain is adjusted before the shear strain is applied to the rubber-like elastic support during installation. And (b) is a cross-sectional view of FIG.
5 (a) is a front view, and FIG. 5 (b) is a cross-sectional view of FIG. 4 (a), showing a holding structure when the distortion adjustment of the rubber-like elastic bearing body of FIG. 4 is performed.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 rubber-like elastic support 2 lower structure 3 upper structure 4 holding jig 5 pressing and moving means 11 upper mounting plate 12 lower mounting plate 13 support 15 second protrusion 21 lower base plate 23 first protrusion 31 upper base plate 41 Jig body 41a Lower surface 41b Upper surface 42 First concave portion 43 Second concave portion 44 Bolt 45 Shim X Shearing direction (direction of applying shear strain)

Claims (16)

After attaching a rubber-like elastic bearing body constituted by providing a bearing between upper and lower mounting plates between a lower base plate fixed to the upper surface of the lower structure and an upper base plate fixed to the lower surface of the expanding and contracting upper structure. A holding structure at the time of strain adjustment for removing shear strain from the rubber-like elastic bearing body that has undergone shear deformation due to expansion and contraction of the upper structure,
The lower base plate has a configuration in which first protrusions are provided on both sides located in a direction intersecting the sheared direction, while the lower mounting plate has first projections on both sides located in a direction intersecting the sheared direction. (2) a rubber-like structure in which a holding jig for maintaining the distance between the first and second protrusions is engaged when the shear strain is removed from the rubber-like elastic bearing body. Retaining structure when adjusting elastic support body strain. The lower base plate has the first protruding portion at an intermediate portion on both sides, the lower mounting plate has the second protruding portion on both sides at both ends, and the second protruding portion with which the holding jig engages is 2. The holding structure according to claim 1, wherein, of the second protrusions at both ends, the second protrusion at the other end located on the opposite side to the direction in which the shear deformation has occurred. 3. The holding jig has a first recess in which the first protrusion can be fitted on the lower surface, and a second recess in which the other second protrusion can be accommodated on the upper surface opposite to the direction in which the first recess is sheared and deformed. A jig body having two recesses; and a bolt protruding from the other side of the jig body into the second recess so as to advance and retreat.
The first protrusion is fitted into the first recess of the jig body, the other second protrusion is housed in the second recess, and the tip of the bolt is the other of the other second protrusion. The holding structure according to claim 2, wherein the holding structure is abutted against the side when adjusting the strain of the rubber-like elastic bearing body. The holding jig has a shim disposed in the second concave portion, and a tip of the bolt is brought into contact with the shim disposed adjacent to the other side of the other second projecting portion accommodated in the second concave portion. A holding structure for adjusting the strain of the rubber-like elastic bearing member according to claim 3. After attaching a rubber-like elastic bearing body constituted by providing a bearing between upper and lower mounting plates between a lower base plate fixed to the upper surface of the lower structure and an upper base plate fixed to the lower surface of the expanding and contracting upper structure. A strain adjustment method for removing a shear strain from the rubber-like elastic bearing body that has been sheared and deformed by expansion and contraction of the upper structure,
The lower base plate has a configuration in which first protrusions are provided on both sides located in a direction intersecting the sheared direction, while the lower mounting plate has first projections on both sides located in a direction intersecting the sheared direction. (2) the first mounting portion is configured to move the lower mounting plate on the lower base plate in the direction of the shear deformation by pressing and moving means to remove shear strain from the rubber-like elastic support; After holding the state in which the shear strain was removed by engaging a holding jig holding the gap with the second protruding portion, the pressing and moving means was removed, and the lower mounting plate was fixed to the lower base plate. Thereafter, a method of adjusting the strain of the rubber-like elastic bearing member, in which the holding jig is removed. The lower base plate has the first protrusion at the middle part on both sides, the lower mounting plate has the second protrusion at both ends on both sides,
The one second protruding portion is pressed by the pressing and moving means disposed between the first protruding portion and the second protruding portion at one end located in the direction of the shearing deformation, thereby lowering the lower mounting plate. The method according to claim 5, wherein the holding jig is engaged with the first protrusion and the other second protrusion by moving the lower jig on the lower base plate. The holding jig includes a first concave portion on the lower surface that can be fitted to the first protruding portion, and a second concave portion on the upper surface on the other side of the first concave portion that can accommodate the other second protruding portion. A jig main body, and a bolt protruding from the other side of the jig main body so as to advance and retreat into the second concave portion;
When the holding jig is engaged, the first protrusion is fitted into the first recess of the jig main body, and after the other second protrusion is housed in the second recess, the bolt is inserted. 7. The method for adjusting the strain of a rubber-like elastic bearing body according to claim 6, wherein the tip of the second elastic member is advanced so that the tip thereof abuts on the other side of the other second protrusion. The holding jig has a shim arranged in the second concave portion, the second concave portion houses the other second projecting portion, and the shim is disposed adjacent to the other side of the other second projecting portion. The method according to claim 7, wherein the bolt is advanced and the tip is brought into contact with the shim. When a rubber-like elastic bearing body having a bearing between upper and lower mounting plates is mounted between a lower base plate fixed to the upper surface of the lower structure and an upper base plate fixed to the lower surface of the contracting upper structure. A holding structure during strain adjustment in which the upper mounting plate is fixed to an upper base plate, and a shear strain amount corresponding to a contraction amount of the upper structure is previously applied to the rubber-like elastic support body,
The lower base plate has a configuration in which first protrusions are provided on both sides positioned in a direction intersecting with the direction in which the shear strain is applied, while the lower mounting plate is positioned in a direction intersecting with the direction in which the shear strain is applied. A second protrusion is provided on both sides, and when a shear strain amount corresponding to the contraction amount of the upper structure is applied to the rubber-like elastic support, the first protrusion and the second protrusion are provided with the second protrusion. A holding structure at the time of adjusting the distortion of the rubber-like elastic support body by engaging a holding jig for holding the gap. The lower base plate has the first protruding portion at an intermediate portion on both sides, the lower mounting plate has the second protruding portion on both sides at both ends, and the second protruding portion with which the holding jig engages is The rubber-like elastic bearing body according to claim 9, wherein the second protrusion at the opposite end is the second protrusion at the other end located on the side opposite to the direction in which the shear strain is applied. Construction. The holding jig is capable of accommodating, on a lower surface, a first concave portion to which the first protruding portion can be fitted, and the other second protruding portion on an upper surface opposite to the direction in which the shear strain is applied from the first concave portion. A jig body having a second concave portion, and a bolt projecting from the other side of the jig body into the second concave portion so as to be able to advance and retreat.
The first protrusion is fitted into the first recess of the jig body, the other second protrusion is housed in the second recess, and the tip of the bolt is the other of the other second protrusion. The holding structure for adjusting the elasticity of the rubber-like elastic bearing member according to claim 10, which is in contact with the side. The holding jig has a shim disposed in the second concave portion, and a tip of the bolt is brought into contact with the shim disposed adjacent to the other side of the other second projecting portion accommodated in the second concave portion. A holding structure for adjusting the strain of the rubber-like elastic bearing body according to claim 11. When a rubber-like elastic bearing body having a bearing between upper and lower mounting plates is mounted between a lower base plate fixed to the upper surface of the lower structure and an upper base plate fixed to the lower surface of the contracting upper structure. In a strain adjusting method, a shear strain amount according to a contraction amount of the upper structure is previously applied to the rubber-like elastic support body in a state where the upper mounting plate is fixed to an upper base plate,
The lower base plate has a configuration in which first protrusions are provided on both sides positioned in a direction intersecting with the direction in which the shear strain is applied, while the lower mounting plate is positioned in a direction intersecting with the direction in which the shear strain is applied. A second projecting portion is provided on both sides, and the lower mounting plate is moved on the lower base plate in a direction in which the shear strain is applied by pressing and moving means, and the upper structure is shrunk to the rubber-like elastic bearing member. After applying the amount of shear strain corresponding to the amount and engaging the holding jig holding the gap between the first protrusion and the second protrusion to maintain the amount of shear strain, the pressing and moving means is removed. And fixing the lower mounting plate to the lower base plate, and then removing the holding jig. The lower base plate has the first protrusion at the middle part on both sides, the lower mounting plate has the second protrusion at both ends on both sides,
The lower mounting is performed by pressing the one second protruding portion by the pressing and moving means disposed between the first protruding portion and the second protruding portion at one end positioned in the direction in which the shear strain is applied. The method according to claim 13, wherein a plate is moved on the lower base plate, and the holding jig is engaged with the first protrusion and the other second protrusion. The holding jig includes a first concave portion on the lower surface that can be fitted to the first protruding portion, and a second concave portion on the upper surface on the other side of the first concave portion that can accommodate the other second protruding portion. A jig main body, and a bolt protruding from the other side of the jig main body so as to advance and retreat into the second concave portion;
When the holding jig is engaged, the first protrusion is fitted into the first recess of the jig main body, and after the other second protrusion is housed in the second recess, the bolt is inserted. 15. The method for adjusting strain of a rubber-like elastic bearing member according to claim 14, wherein the tip of the second elastic member is advanced to abut the other end of the second protrusion. The holding jig has a shim arranged in the second concave portion, the second concave portion houses the other second projecting portion, and the shim is disposed adjacent to the other side of the other second projecting portion. The method according to claim 15, wherein the bolt is moved forward so that the tip thereof abuts on the shim.

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